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dashwood

Joined: 24 Jan 2009
Posts: 73
Location: sw ontario canada

Posted: Sat Feb 12, 2011 10:43 am Post subject: regulators

i have a 701 /912 with a ducati reg on it. got a low voltage warning last time out. checked resistance of two leads coming from engine coils shows 7.2 ohms. (at) rotax manuel. the 12v dc side of the reg has a red wire out of firewall to firstcontact (R). labeled alternator switch. R has jumper to B+. the next contact( B+) is daisy chanind  to (C) also wired to 120000 mfd capacitor and from there to solid ground. checked fuse panel and found a  blown 15amp fuse on a wire labeled alternator. what was the builder trying to do with this fuse. i have been told by others if you shut off alternator loads while engine is running it will fry the reg.  i have two switches on panel labeled master and alternator  and was told always on shutdown one first then the other , never in the opposite order with threat of dire consequences. could this fuse be an over voltage / draw protection for the rest of the buss or has it somehow protected the reg from me fumbling with the panel switches. i have changed the fuse but not been able to test run engine  and see if this fuse holds, due to howling blizzard here. hanger-ed but open into the wind today .

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_________________
Ross Alexander: CH701 driver 912ul 788tt
It only takes two things to fly, airspeed and money

Last edited by dashwood on Sat Feb 12, 2011 6:25 pm; edited 2 times in total

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sat Feb 12, 2011 3:07 pm Post subject: regulators

Ross, Suggest you review Section 17, pages 107-111 of the Rotax 912 Installation Manual.



Rick Girard



On Sat, Feb 12, 2011 at 12:43 PM, dashwood <dashwoodlock(at)hotmail.com (dashwoodlock(at)hotmail.com)> wrote:

  	  Quote: 	
		  --> RotaxEngines-List message posted by: "dashwood" <dashwoodlock(at)hotmail.com (dashwoodlock(at)hotmail.com)>

  

 i have a 701 /912 with a ducati reg on it. got a low voltage warning last time out. checked resistance of two leads coming from engine coils shows 7.2 ohms. (at) rotax manuel. the 12v dc side of the reg has a red wire out of firewall to first / next contact on reg. labeled alternator switch. the next contact is jump wired to first and 4th contact. 4th also has wire to 12000mfd capacitor and from there to solid ground. checked fuse panel and found a  blown 15amp fuse on a wire labeled alternator. what was the builder trying to do with this fuse. i have been told by others if you shut off alternator loads while engine is running it will fry the reg.  i have two switches on panel labeled master and alternator  and was told always on shutdown one first then the other , never in the opposite order with threat of dire consequences. could this fuse be an over voltage / draw protection for the rest of the buss or has it somehow protected the reg from me fumbling with the panel switches!

   . i have changed the fuse but not been able to test run engine  and see if this fuse holds, due to howling blizzard here. hanger-ed but open into the wind today .

 

 --------

 Ross Aalexander: CH701 driver 912ul 450tt

 

 

 

 

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Zulu Delta

Mk IIIC

Thanks, Homer GBYM

It isn't necessary to have relatives in Kansas City in order to be unhappy.

   - Groucho Marx



 

  [quote][b]

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dashwood

Joined: 24 Jan 2009
Posts: 73
Location: sw ontario canada

Posted: Sat Feb 12, 2011 6:12 pm Post subject: Re: regulators

thanks. i was not able to find the pages i needed before. i think the fuse i have blown  is the 25A  after the reg terminals. the capacitor is in place and should have protected the reg as/per manual. when you close 16(master) then 19 relay pulls on the battery supply to fuse bus. i have an endurance fuse bus as well. somehow an alternator disconnect  that draws minimal power only from battery to supply minimal flight requirements. i assume to guard against over voltage (failed reg). i don't see this in the diagram. not sure if master has to be shut off first to stop feedback( blowing the 25A fuse). i just want to understand what is happening so i can fix or not have happen in flight again.

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_________________
Ross Alexander: CH701 driver 912ul 788tt
It only takes two things to fly, airspeed and money

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sun Feb 13, 2011 6:07 am Post subject: regulators

Ross, Pay special attention to the capacitor. It's the protection for the regulator. The proper size can be had from B & C Specialties, Mouser, Allied, or others but you really should upgrade to the 25000 mfd min. size. 



Rick



On Sat, Feb 12, 2011 at 8:12 PM, dashwood <dashwoodlock(at)hotmail.com (dashwoodlock(at)hotmail.com)> wrote:

 	  Quote: 	
		   --> RotaxEngines-List message posted by: "dashwood" <dashwoodlock(at)hotmail.com (dashwoodlock(at)hotmail.com)>

 

 thanks. i was not able to find the pages i needed before. i think the fuse i have blown  is the 25A  after the reg terminals. the capacitor is in place and should have protected the reg as/per manual. when you close 16(master) then 19 relay pulls on the battery supply to fuse bus. i have an endurance fuse bus as well. somehow an alternator disconnect  that draws minimal power only from battery to supply minimal flight requirements. i assume to guard against over voltage (failed reg). i don't see this in the diagram. not sure if master has to be shut off first to stop feedback( blowing the 25A fuse). i just want to understand what is happening so i can fix or not have happen in flight again.

  

 --------

 Ross Aalexander: CH701 driver 912ul 450tt

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=330827#330827

 

 

 

 

 

 

 

 ===========

 -List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List

 ===========

 http://forums.matronics.com

 ===========

 le, List Admin.

 ="_blank">http://www.matronics.com/contribution

 ===========

 

 

 

 	


-- 

Zulu Delta

Mk IIIC

Thanks, Homer GBYM

It isn't necessary to have relatives in Kansas City in order to be unhappy.

   - Groucho Marx



 

  [quote][b]

- The Matronics RotaxEngines-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
The smallest miracle right in front of you is enough to make you happy....

e.brian44(at)yahoo.com
Guest

Posted: Tue Feb 15, 2011 1:47 pm Post subject: regulators

Hi dashwood

  

 I have been working on a high volt protection system for my 912 aircraft electrics.  Simply the 2 output wires from the alternator to the rectifier are run through 2 break contacts of a 12v relay.  The relay is powered from the aircraft batt via a fuse and MCB, should the voltage rise on the rail above 16v a 'crowbar' fires releasing the relay and disconnecting the alternator, then the electrical system is running on the on board batt.  

  

 The only problem I have is trying to get hold of a male / female (plug and socket) to patch out and pick up the alternator supply at the regulator plug, any ideas where to obtain one from or has someone already supplying such a system.

  

 Brian  



 

   From: dashwood <dashwoodlock(at)hotmail.com>

To: rotaxengines-list(at)matronics.com

Sent: Sun, February 13, 2011 2:12:27 AM

Subject: Re: regulators



--> RotaxEngines-List message posted by: "dashwood" <dashwoodlock(at)hotmail.com (dashwoodlock(at)hotmail.com)>



thanks. i was not able to find the pages i needed before. i think the fuse i have blown  is the 25A  after the reg terminals. the capacitor is in place and should have protected the reg as/per manual. when you close 16(master) then 19 relay pulls on the battery supply to fuse bus. i have an endurance fuse bus as well. somehow an alternator disconnect  that draws minimal power only from battery  to supply minimal flight requirements. i assume to guard against over voltage (failed reg). i don't see this in the diagram. not sure if master has to be shut off first to stop feedback( blowing the 25A fuse). i just want to understand what is happening so i can fix or not have happen in flight again.



--------

Ross Aalexander: CH701 driver 912ul 450tt





Read this topic online here:



http://forums.matronics.com/vi                    -Matt==============



               [quote][b]

- The Matronics RotaxEngines-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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